船舶重要舱室噪声预报及防护设计

Noise Prediction and Protection Design of Important Ship Cabins

以某勘探船为例,采用统计能量分析(Statistical Energy Analysis,SEA)法对重要舱室噪声进行预报,并对超标舱室进行声学防护设计。利用声学分析软件VA One建立声学模型,对只考虑钢材损耗因子不考虑内装材料影响的舱室声压级进行预报,确定主要激励源和传递路径。在此基础上,预报添加内装材料后的舱室声压级,对声压级超规范许用值位置进行降噪处理。对于空气噪声,大部分采用添加隔声板的方式进行降噪处理;对于结构噪声,主要采用隔振的方式,即将大型设备基座由刚性支座改为弹簧支座的形式。在采取降噪措施后,全船重要舱室均满足中国船级社(CCS)规范噪声舒适性附加标识COMF(NOISE 2)标准要求。研究结果可用于同类型勘探船舶降噪设计,为其他类型船舶舱室的降噪设计提供参考。

Taken an exploration ship as an example,the noise of the important cabins is forecasted by Statistical Energy Analysis(SEA)method and the acoustic protection for the cabins exceeding the standard is designed.Acoustic analysis software VA One is used to establish an acoustic model,and the cabin sound pressure level is predicted when the steel loss factor is taken into account and the influence of internal materials is not considered,so as to determine the main excitation source and transmission path.On this basis,the position exceeding the allowable value of the sound pressure level is denoised by predicting the sound pressure level of the cabin after the addition of internal materials.For the air noise,most of the noise is reduced by adding sound insulation board.For the structural noise,vibration isolation is mainly adopted,namely,the base of large equipment is changed from rigid support to spring support.After noise reduction measures are taken,all the ship's important cabins meet the COMF(NOISE 2)standard of China Classification Society's code for noise comfort.The research results can be used for noise reduction design of the same type of exploration ships and reference can be provided for noise reduction design of cabins of other types of ships.